| 摘要 |
<p>PROBLEM TO BE SOLVED: To make volume of a synthetic resin bottle changeable by forming the bottle easily and sufficiently flat and restorable so that the bottle can be handled easily, efficiently and cost effectively in processes from forming to filling and in disposal. SOLUTION: An inclined step-shaped reversible line 5 is formed in an axially symmetrical position and along with a total longitudinal surrounding of a bottle. One side divided at the reversible line is formed of a half shell part 6 of which thickness is normal, while the other half is formed of a reversible part 7 of which diameter is a little smaller than and thickness is smaller than that of the half shell part 6, and shape is changeable due to elastic reversion. The total reversible part 7 can be retracted inside of the half shell part 6 and also returned to its original shape, and thereby increasing and decreasing of a volume of the bottle can be achieved simply and without inconvenience.</p> |
